Front Wheel Bearing Housing - Repairing Thread

Information 

The thread must be clean and free of grease.

Information 

• All tasks must be done manually. 
• Use cutting oil for thread repairs. 
• Figure numbers are identical to the end numbers of the tools. 

1. Drill out thread.
   1. 1.1 Fit assembly aid -1-  on the intact thread using a fastening screw -3-  .

      Courtesy of PORSCHE CARS NORTH AMERICA, INC.

      Assembly aid

   2. 1.2 Fit guide sleeve -7-  into assembly aid. Drill out the thread as far as the stop using a threading die holder -6-  and drill bit -1-  .

      Courtesy of PORSCHE CARS NORTH AMERICA, INC.

      Guide sleeve, threading die holder and drill bit

   3. 1.3 Remove assembly aid.
   4. 1.4 Carefully blow drilling chips out of the bore hole.
2. Countersink the bore hole.
   1. 2.1 Using the seat miller -2-  , countersink the bore until the stop of the seat miller is seated completely on the wheel bearing housing -LHD vehicle -  .

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.

   Seat miller

3. Check countersink depth.
   1. 3.1 Fit threaded bush -5-  into the bore hole against the screw-in direction. The collar of the threaded bush must be seated up to the first thread in the countersink in the wheel bearing housing -LHD vehicle -  .

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.

   Checking countersink depth

4. Cut thread.
   1. 4.1 Fit assembly aid -1-  using a fastening screw -3-  .

      Courtesy of PORSCHE CARS NORTH AMERICA, INC.

      Assembly aid

   2. 4.2 Push guide sleeve -8-  onto the tap -3-  . Oil the tap.

      Courtesy of PORSCHE CARS NORTH AMERICA, INC.

      Guide sleeve on tap

   3. 4.3 Insert the tap -3-  into the assembly aid -1-  . The guide sleeve -8-  must project slightly out of the assembly aid. The guide sleeve will drop during the cutting process.

      Courtesy of PORSCHE CARS NORTH AMERICA, INC.

      Tap in assembly aid

   4. 4.4 Fit threading die holder -6-  . Carefully cut the thread as far as the stop.

      Courtesy of PORSCHE CARS NORTH AMERICA, INC.

      Threading die holder

   5. 4.5 Remove assembly aid.
   6. 4.6 Carefully blow drilling chips out of the bore hole.
5. Re-mill the bore hole.
   1. 5.1 Using the seat miller -2-  , countersink the bore again until the stop of the seat miller is seated completely on the wheel bearing housing -LHD vehicle -  .

      Courtesy of PORSCHE CARS NORTH AMERICA, INC.

      Seat miller

   2. 5.2 Carefully cut the thread again as far as the stop using the tap. The tap must screw out without catching.
   3. 5.3 Check again that the collar of the threaded bush -5-  has disappeared in the recess. Otherwise, repeat the milling process  .

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.

   Checking countersink depth

6. Carefully blow drilling chips out of the bore hole and clean the thread using brake cleaner.

   Information 

   The collar of the threaded bush must be at least 0.2 mm  under the edge of the wheel bearing housing.

7. Screw in threaded bush.
   1. 7.1 Screw in the threaded bush as far as possible by hand.
   2. 7.2 Oil the screw-in tool -4-  and screw it in by hand until the threaded bush is sitting slightly deeper in the bore hole on the wheel bearing housing.

      Courtesy of PORSCHE CARS NORTH AMERICA, INC.

      Screw-in tool

   3. 7.3 Continue screwing in the threaded bush using the threading die holder. You will feel increased resistance when the threaded bush is slightly deeper in the bore hole. Continue screwing carefully until there is less resistance again.
   4. 7.4 The screw-in tool -4-  must screw out without catching.
   5. 7.5 The threaded bush -5-  is inserted at the correct position when the collar -Arrows-  is below the contact surface of the wheel bearing housing -LHD vehicle -  .

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.

   Threaded bush inserted at the correct position

8. Rinse the thread with brake cleaner.